Re: gEDA-user: Comments on pcb's g-code

[<jbump@xxxxxxxx>]

Sorry that LPKF stuff is off-topic but I just figured out a way to 
make tabs on boards that might help someone.  There is a button in 
circuit cam to calculate and draw breakout-tab cutting outlines but it 
flat-out doesn't work for me so I'm going to talk about the harder way.

Draw your desired board outline.  Decide on which width routing bit 
you're going to use.  I'm going to assume you're using a 1mm router, 
which is 40 mils in diameter.  Draw a second board outline, outside of 
your existing board outline, such that the width between the copper 
edges is 40 mils.  Typically I draw board outlines 10mils thick, so 
that'd be 50 mils center-to-center offset.  Draw the outer outline with 
gaps that are 120 mils wide.  That way when it's routed there will be 
120mils - 2x(40mils router width) = 40 mils of uncut board material 
holding the board into the uncut surrounding material.



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